Smart 855 Cummins Low Flow Cooling System Diagram : Checklist For Beginners. The second portion of water flows from the cavity of the water pump housing through the oil cooler and tubing to the rear of the water manifold forward to the thermostat housing, to. The system must be filled thru this port with the engine running, very slow process, takes about 2 hours.
They were all low flow cooling. It just started leaking coolant. Cummins nh/ nt 855 c.i.d.